Sachs B D, Bialy M
Department of Psychology, University of Connecticut, Storrs 06269-1020, USA.
Behav Neurosci. 2000 Dec;114(6):1203-8. doi: 10.1037//0735-7044.114.6.1203.
During the postejaculatory interval (PEI), male rats exhibit prolonged immobility, 22-kHz vocalization, and penile erections. To test whether females modulate these behaviors, females were removed after the first or second ejaculation or left in the test chamber. Female presence during the PEI delayed exploratory behavior and facilitated vocalization and erection. Female stimulation of vocalization is consistent with the hypothesis that vocalization has a communicative function, not just a thermoregulatory one. The timing of the effect of females on erection suggests that males are sexually arousable well before they resume copulation. Therefore, erection may be better than vocalization as an indicator of the male's sexual refractoriness. The findings also challenge the conventional view that the PEI comprises absolute and relative sexual refractory periods marked, respectively, by the presence and absence of 22-kHz vocalization.
在射精后间隔期（PEI），雄性大鼠表现出长时间不动、发出22千赫兹的叫声以及阴茎勃起。为了测试雌性是否会调节这些行为，在第一次或第二次射精后将雌性移除，或者让雌性留在测试室中。PEI期间雌性的存在延迟了探索行为，并促进了发声和勃起。雌性对发声的刺激与发声具有交流功能而非仅仅是体温调节功能的假设相一致。雌性对勃起产生影响的时间表明，雄性在恢复交配之前很久就具有性唤起能力。因此，作为雄性性不应期的指标，勃起可能比发声更好。这些发现也挑战了传统观点，即PEI分别由22千赫兹叫声的存在和不存在所标志的绝对和相对性不应期组成。
